The impact of soil water repellency (SWR) on soil phosphorus (P) mobility in surface water runoff remains contentious. Although SWR may cause a significant increase in surface runoff, especially in post-summer rainfall events, whether it contributes to background phosphorus losses remains unclear. Surface runoff and P concentrations in runoff were measured on hilly Allophanic pastoral soils with different water repellency levels using seven runoff collectors. Phosphorus fertilizer was broadcasted at 18 kg P ha⁻¹ in the summer over dry soils. Runoff volumes and P concentrations were measured after each natural rain event prompting surface runoff. The highest runoff/rainfall ratios were observed at the early rainfall events following the dry summer and then decreased significantly by the end of autumn and winter. The post-summer surface runoff correlation with SWR had an R² of 0.46, and hydrophobic soils had significantly higher runoff ratios than wettable soils. Measurements of the dissolved reactive phosphorus (DRP) and total phosphorus (TP) in the surface runoff showed decreasing exponential trends, with the highest values recorded in the first runoff event following P fertilizer application, where over 90% of losses occurred (incidental losses). After the incidental loss phase, DRP concentrations were related to surface runoff ratio, soil P extractability by water, and SWR. Our data point to non-incidental TP loads being related to SWR (R² = 0.53). The present results will improve the understanding of the SWR effect on surface runoff and will reconcile the controversy regarding its contribution to non-incidental P losses.

土壤拒水性 (SWR) 对地表水径流中土壤磷 (P) 迁移率的影响仍然存在争议。尽管 SWR 可能导致地表径流显着增加，尤其是在夏季后降雨事件中，但它是否会导致背景磷损失仍不清楚。地表径流和径流中的 P 浓度使用七个径流收集器在具有不同防水水平的丘陵化肥牧区土壤上进行测量。以 18 kg P ha ^-1喷施磷肥夏季在干燥的土壤上。在每次引发地表径流的自然降雨事件后测量径流体积和 P 浓度。在干燥夏季之后的早期降雨事件中观察到最高的径流/降雨量比，然后在秋季和冬季末显着下降。夏季后地表径流与 SWR 的相关性为 R ²0.46，疏水性土壤的径流比明显高于可湿性土壤。地表径流中溶解活性磷 (DRP) 和总磷 (TP) 的测量显示呈指数下降趋势，最高值记录在施磷肥后的第一次径流事件中，其中超过 90% 的损失发生（附带损失） . 在偶然损失阶段之后，DRP 浓度与地表径流比、土壤磷的可提取性和 SWR 相关。我们的数据指向与 SWR 相关的非偶然 TP 负载（R ² = 0.53）。目前的结果将提高对 SWR 对地表径流影响的理解，并将调和关于其对非偶然 P 损失的贡献的争议。